Insulating means for electrical apparatus.



Y No. 728,152. PATENTED MAY 12. 1903..

' P. BATCHBLDER'. INSULATING MEANS FOR' ELECTRICAL APPARATUS.

APPLICATION FILED SEPT. 17. 1902.

N0 MODEL.

: i I A a J 4 r f -H 1 F 4 .AE'A 'A'AA B Fig.1.

-' 7 +11 Witnesses. Inventor.

- I vqsa Batcheldef,

UNITED STATES Patented May 12, 1903.

PATE T OFFICE.

ASA F. BATCHELDER, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL APPARATUS.

SPECIFICATION forming part of Letters Patent No. 728,152, dated May 12,1903.

Original application filed September 3, 1901, Serial No. 74,245. No.123,792.

To all whom it may concern:

Be it known that I, ASA F. BATOHELDER, a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Insulating Means forElectrical Apparatus, (Case No. 3,127, a division of my application,Serial No. 74,245, filed September 3, 1901,) of which the following is aspecification.

My invention relates to means for insulating electrical apparatus, andmore especially to such apparatus or parts thereof as are subjected tovibrations and strains.

The object of my invention is to provide means for electricallyinsulating one part from another, which will permit a rigid or drivingfit to be made between the parts.

In carrying out my invention I employ an insulating material which isadapted to withstand relatively large compression strains, such as mica,and form it intoashell shaped to fit a cavity or recess formed in onemember and protect the inner surface thereof by an expansible metallicshell and drive the male member into the flexible metallic shell. Byproperly regulating the thickness of the insulating and metallic shellsand the diameters of the male and female membersadrivo ing fit may beobtained at the insulated joint which is fully as secure againstdisplacement as in the case of a driving fit between two metallic parts.

My invention will be more readily under- 5 stood by reference to theaccompanyingdrawings, forming a part of this specification, in which--Figure l is an elevation of a brush-holder connected to itssecuring-plate by means of a stud insulated therefrom according to oneform of my invention, and Fig. 2 is a trans-v verse section of thestudand insulation.

As shown in the drawings,the brush-holder E is provided with acylindrical socket 6, ex-

5 tending therethrough. In the socket e is placed one end of a tube F,of dry mica or other insulating material capable of withstandingcompression strains. Care is taken in shaping the tube F to have it ofuniform Divided and this application filed September 17, 1902, Serial(No model.)

thickness and of an external diameter to fit the socket e. An expansiblelining G of sheet metal, preferably made in the form of a split tube, asshown in Fig. 2, is placed within the tube F. In assembling the partsthe expansible tube G may be supported on an anvil adapt-ed to enter thelower end of the socket e, and the stud D, which is carefully turned tothe proper size, is driven into the upper end of the eXpansible tube G.By reason of the non-compressible nature of the insulating material Fthe frictional engagement of the several parts D G F E upon one anotheris as great as in the case of a driving .fit of iron upon iron.

The lower end of the insulating-tube F is closed 'loy'a' mica disk f,inserted in the lower end of socket e and tightly engaging the innerwalls of the tube F. In cases where the socket is open at one end onlythe mica disk will .be forced down into place before the expansible tubeG is inserted.

The tube of insulation F extends a considerable distance outside thesocket e, and in order to protect it from injury, either from blows orabrasion, I provide a protector Bin the form of a sleeve made ofsuitable insulating material, such as hard rubber or porcelain. Theprotector H is provided with a corrugated outer surface to increase thecreeping-surface.

It is apparent that the insulating-tube F and the mica disk f might bemade integral, that the expansible tube G might be made of a singlepiece of readily-expansible metal, and that other changes might be madewithout departing from the spirit and scope of my invention. I

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. Means for supporting and insulating 9o electrical apparatus, whichcomprises a metal portion provided with a socket, a metal stud adaptedto enter said socket, insulation between the stud and the socket, and anexpansible metal lining between the stud and the 5 insulation.

2. Means for supporting and insulating electrical apparatus, whichcomprises a metal lating material and the stud in said socket, and asmooth-surfaced protector surrounding the projecting portion of theinsulating material.

In witness whereof I have hereunto set my portion having a socket, atube of insulation f l hand this 12th day of September, 1902. I I lfitting said socket, a split metal lining for said tube, and a metalstud having a driving fit in said lining.

3. Means for supporting and insulating electrical apparatus, whichcomprises a metal portion having a socket, a tube of insulating materialfitting said socket and projecting beyond the same, a two-part metallining in said tube, a metal stud'adapted to be driven into said liningto expand it and Wedge the insu- ASA F. BATOHELDER.

Witnesses:

EDWARD WILLIAMS, J12, HELEN ORFORD.

